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Artigos de revistas sobre o assunto "SERS SUBSTRAT"
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Sari, Kartika, Rosy Hutami, Azzahra Putri Rialdi, Marlinda Indriati e Anna Mardiana Handayani. "Ulasan Kritis Artikel : Democratizing Robust SERS Nano-Sensors for Food Safety Diagnostics". Karimah Tauhid 3, n.º 11 (12 de novembro de 2024): 12175–96. https://doi.org/10.30997/karimahtauhid.v3i11.15859.
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Sebuah artikel yang berjudul “Democratizing Robust SERS Nano-Sensors for Food Safety Diagnostics” melaporkan metode deteksi residu pestisida yang lebih cepat dari metode deteksi lainnya (SERS). Teknik SERS yang dilaporkan penulis berbasis pada nano-sensor yang terbentuk dari nanopartikel Ag dan nano-thin SiO2 dengan metode Flame Spray Pyrolysis (FSP). Metode ulasan yang dilakukan adalah dengan menetapkan satu artikel terpilih dan mengkritisinya. Hasil yang didapatkan dari ulasan ini adalah pada beberapa parameter pengujian, penulis tidak mencantumkan jumlah pengulangan, waktu, dan jumlah sampel yang dianalisis. Namun, penulis menyampaikan secara jelas tentang validasi metode yang digunakan menggunakan sistem alat Raman portable spectrometer. Kami menyoroti adanya data penting yang disampaikan pada supplementary data yang dapat ditampilkan dalam artikel utama. Penulis juga belum mengemukakan alasan pemilihan rhodamine 6G. Penulis belum mengemukakan alasan pemilihan jus jeruk sebagai sampel uji deteksi. Kami menilai bahwa produk SERS hasil penelitian penulis sudah dekat dengan proses aplikasi komersial. Tujuan penelitian yang dikemukakan penulis telah tercapai meskipun tidak dijelaskan secara khusus perhitungan biaya produksi substrat SERS yang dihasilkan.
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Mayerhöfer, Thomas G., e Jürgen Popp. "Periodic array-based substrates for surface-enhanced infrared spectroscopy". Nanophotonics 7, n.º 1 (1 de janeiro de 2018): 39–79. http://dx.doi.org/10.1515/nanoph-2017-0005.
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AbstractAt the beginning of the 1980s, the first reports of surface-enhanced infrared spectroscopy (SEIRS) surfaced. Probably due to signal-enhancement factors of only 101 to 103, which are modest compared to those of surface-enhanced Raman spectroscopy (SERS), SEIRS did not reach the same significance up to date. However, taking the compared to Raman scattering much larger cross-sections of infrared absorptions and the enhancement factors together, SEIRS reaches about the same sensitivity for molecular species on a surface in terms of the cross-sections as SERS and, due to the complementary nature of both techniques, can valuably augment information gained by SERS. For the first 20 years since its discovery, SEIRS relied completely on metal island films, fabricated by either vapor or electrochemical deposition. The resulting films showed a strong variance concerning their structure, which was essentially random. Therefore, the increase in the corresponding signal-enhancement factors of these structures stagnated in the last years. In the very same years, however, the development of periodic array-based substrates helped SEIRS to gather momentum. This development was supported by technological progress concerning electromagnetic field solvers, which help to understand plasmonic properties and allow targeted design. In addition, the strong progress concerning modern fabrication methods allowed to implement these designs into practice. The aim of this contribution is to critically review the development of these engineered surfaces for SEIRS, to compare the different approaches with regard to their performance where possible, and report further gain of knowledge around and in relation to these structures.
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Ossig, R., Y. H. Kwon, F. Hubenthal e H. D. Kronfeldt. "Naturally grown Ag nanoparticles on quartz substrates as SERS substrate excited by a 488 nm diode laser system for SERDS". Applied Physics B 106, n.º 4 (7 de fevereiro de 2012): 835–39. http://dx.doi.org/10.1007/s00340-011-4866-8.
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Liu, Chang, Qianqian Su, Li Li, Jie Sun, Jian Dong e Weiping Qian. "Substrate-Immersed Solvothermal Synthesis of Ordered SiO2/Ag Arrays as Catalytic SERS Substrates". Nano 13, n.º 05 (maio de 2018): 1850049. http://dx.doi.org/10.1142/s1793292018500492.
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In this work, we designed a simple substrate-immersed solvothermal route for the one-step synthesis of novel ordered SiO2/Ag arrays, employing SiO2 colloidal crystals as templates and alcohol as reducing agent. The Ag nanoparticles were uniformly deposited in situ onto SiO2 colloidal crystals, which exhibited high surface enhanced Raman spectroscopy (SERS) activity and uniform SERS intensity. It was found that ordered SiO2/Ag arrays could rapidly scavenge the absorbed-Nile blue A (NBA) molecules from the surfaces with the assistance of H2O2, while the SERS signals of NBA decreased sharply and almost completely disappeared within four minutes. This can be attributed to the superior catalytic activity of Ag nanoparticles. After five times of re-immersion and re-absorbing process of NBA, the substrates could still keep [Formula: see text] 74.8% SERS intensity versus the original. The high activity and durability of the as-prepared SiO2/Ag SERS substrate endow them as a promising candidate for trace detection.
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Yao Senhao, 姚森浩, 冉娜 Ran Na, 王宁 Wang Ning e 张洁 Zhang Jie. "银纳米树SERS基底拉曼增强特性". Acta Optica Sinica 44, n.º 21 (2024): 2130001. http://dx.doi.org/10.3788/aos241183.
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Zhang, Liyuan, Xu Li, Lydia Ong, Rico F. Tabor, Brianna A. Bowen, Aeshin I. Fernando, Azadeh Nilghaz et al. "Cellulose nanofibre textured SERS substrate". Colloids and Surfaces A: Physicochemical and Engineering Aspects 468 (março de 2015): 309–14. http://dx.doi.org/10.1016/j.colsurfa.2014.12.056.
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Wu Chunfang, 吴春芳, 段鹏飞 Duan Pengfei, 潘浩 Pan Hao, 朱业传 Zhu Yechuan, 张凯锋 Zhang Kaifeng, 李坤 Li Kun e 魏杰 Wei Jie. "一种光栅/纳米颗粒结构的双共振SERS基底". Acta Optica Sinica 42, n.º 14 (2022): 1405002. http://dx.doi.org/10.3788/aos202242.1405002.
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Lai Chunhong, 赖春红, 赖林 Lai lin, 张芝峻 Zhang Zhijun, 张帅康 Zhang Shuaikang, 姜小明 Jiang Xiaoming e 刘家瑜 Liu Jiayu. "基于金纳米颗粒-半胱胺SERS基底的水中硝酸根检测". Chinese Journal of Lasers 49, n.º 11 (2022): 1111002. http://dx.doi.org/10.3788/cjl202249.1111002.
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Wu Chunfang, 吴春芳, 张焱 Zhang Yan, 潘浩 Pan Hao, 朱业传 Zhu Yechuan, 杨占君 Yang Zhanjun e 魏杰 Wei Jie. "金光栅/金纳米颗粒SERS基底的设计、制备及其性能". Acta Optica Sinica 43, n.º 21 (2023): 2124001. http://dx.doi.org/10.3788/aos230867.
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Cintra, Suzanne, Mamdouh E. Abdelsalam, Philip N. Bartlett, Jeremy J. Baumberg, Timothy A. Kelf, Yoshihiro Sugawara e Andrea E. Russell. "Sculpted substrates for SERS". Faraday Discuss. 132 (2006): 191–99. http://dx.doi.org/10.1039/b508847j.
Texto completo da fonteTeses / dissertações sobre o assunto "SERS SUBSTRAT"
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Gillibert, Raymond. "Développement d’un substrat SPRi/SERS pour des applications en détection moléculaire". Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCD003/document.
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Dans cette thèse, nous décrivons sommairement les techniques utilisées qui sont l’imagerie parrésonance plasmon de surface (SPRi) et la diffusion Raman exaltée de surface (SERS). Le butprincipal du projet Piranex dans lequel la thèse s’inscrit consiste au développement d’une biopucenanostructurée bimodale permettant le couplage des deux techniques SPRi et SERS. Cettebiopuce est constituée d’un film d’or par-dessus lequel nous avons déposé un réseau carré denanocylindres en or. Un ensemble d’études ont été effectuées pour caractériser ses propriétésplasmoniques du biocapteur afin d’en optimiser le signal SERS. Nous avons ainsi constaté quel’émission du signal était fortement anisotrope, dus à l’excitation du Mode de Bragg et que lechamp proche était principalement exalté sur les bords de la nanostructure. Les propriétés furentégalement comparées avec celles de réseaux identiques déposés directement sur un substrat diélectrique.Par la suite un ensemble d’études plasmoniques et SERS ont été effectuées pourl’aluminium, autre matériaux plasmonique d’intérêt. Enfin, un protocole de détection par SERSde l’ochratoxine basé sur un aptamère fut développé et a permis la détection de l’ochratoxine dès10 pM, bien en dessous de la limite autorisée par les organismes de régulation en agroalimentaireIn this thesis, we briefly describe the techniques used, which are surface plasmon resonanceimaging (SPRi) and surface enhanced Raman scattering (SERS). The main goal of the Piranexproject in which the thesis is based is the development of a bimodal nanostructured biochipallowing the coupling of the two techniques SPRi and SERS. This bio-chip consists of a goldfilm over which we have deposited a square array of gold nanocylinders. A set of studies hasbeen carried out to characterize plasmonic properties of the biosensor in order to optimize theSERS signal. We have thus found that the emission of the signal was strongly anisotropic, due tothe excitation of the Bragg Mode and that the near field was mainly enhanced on the edges of thenanostructure. The properties were also compared with those of identical gratings depositeddirectly on a dielectric substrate. Subsequently a set of plasmonic and SERS studies were carriedout for aluminum, other plasmonic materials of interest. Finally, a detection protocol by SERS ofochratoxin based on an aptamer was developed and allowed the detection of ochratoxin with adetection threshold of 10 pM, well below the limit allowed by food regulatory agencies
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Dridi, Hamida. "Méthodologies pour la réalisation d'un substrat SERS à base de silicium poreux pour la détection de molécules chimiques et biologiques". Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S012/document.
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Le travail de cette thèse porte sur la réalisation de substrats SERS (Surface Enhanced Raman Scattering) pour la détection d'espèce chimiques et biologiques. Il s'agit de mettre en place des méthodologies utilisant comme surface de départ celle d'une couche poreuse de silicium et un effet de Plasmon de surface induit par la présence d'un métal noble en général. Les spécificités des couches poreuses qui sont d'une part une rugosité nanométrique et d'autre part une porosité et donc une surface interne modulable ont une incidence directe sur la sensibilité de détection de molécules cibles. Nous avons développé dans ce manuscrit de thèse différentes méthodes d'élaboration de substrats SERS à base de couches poreuses de silicium. Nous avons envisagé deux voies, la première se base sur l'utilisation des nanoparticules d'or en solution colloïdale. La deuxième voie, plus originale, utilise le dépôt d'or par pulvérisation cathodique sur une couche poreuse préparée sur la face rugueuse de silicium. Des résultats SERS intéressants, concernant la détection de molécules chimique (Rhodamine 6G) et biologique (Albumine Sérum Bovin), ont été décrits et expliqués permettant d'envisager diverses solutions afin de les optimiserThe work of this thesis focuses on the realization of SERS substrates (Surface Enhanced Raman Scattering) for the detection of chemical and biological species. This is to implement the methodologies using as the starting surface of a porous silicon layer and a surface Plasmon effect induced by the presence of a noble metal in general. The specificities of the porous layers which are firstly a nanometer roughness and secondly a porosity and therefore an inner surface have a direct impact on the target molecule detection sensitivity. We have developed in this PhD thesis different substrates development methodologies SERS-based on porous silicon layers. We considered two ways, the first is based on the use of gold nanoparticles in colloidal solution. The second route, more original, uses the deposition of gold by sputtering on a porous layer prepared on the rough side of a silicon wafer. Interesting SERS results regarding the detection of chemical (Rhodamine 6G) and biological (Bovin Serum Albumin) molecules, have been described and explained for considering various solutions to optimize them
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Iakab, Stefania-Alexandra. "Gold-Coated Black Silicon Nanostructured Surfaces for SERS and SALDI-MS Multimodal Imaging of Biological Applications". Doctoral thesis, Universitat Rovira i Virgili, 2021. http://hdl.handle.net/10803/672198.
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La caracterització in situ de la composició molecular dels teixits biològics és indispensable en la investigació clínica, farmacèutica i forense. Les tècniques d’imatge molecular, com l’espectrometria de masses d’imatge i les imatges per espectroscòpia Raman, empren materials nanoestructurats per abordar reptes com la baixa sensibilitat, l’especificitat i la resolució lateral. L’objectiu d’aquesta tesi és dissenyar, fabricar, avaluar i aplicar un substrat nanoestructurat basat en or i silici (que denominem “AuBSi”) compatible amb aplicacions d’espectrometria de masses d’imatges per desorció/ionització per làser assistides per superfície (SALDI-MS) i espectroscòpia Raman intensificada per superfície (SERS). Els resultats demostren que el substrat AuBSi és reproduïble, fàcil de fer servir, rendible i altament fiable. Assegura una fàcil preparació de la mostra i és totalment compatible amb les dues modalitats d’imatge, cosa que permet un enfocament veritablement multimodal. Mostrem que hi ha una unificació entre els formats de dades SALDI i SERS que permet la integració completa del flux de treball de processament d’imatges i el co-registre d’imatges.. S’han provat les capacitats d’obtenció d’imatges del substrat AuBSi en diverses solucions d’estàndards, seccions histològiques de teixit animal (fetge, ronyó i cervell de ratolí) i empremtes dactilars. L’anàlisi multimodal d’empremtes dactilars va destacar les excel·lents capacitats del substrat per acoblar imatges SALDI i SERS, alhora que s’aconsegueix pal·liar les limitacions de cada tècnica. Així doncs, el substrat AuBSi desenvolupat en aquesta tesi facilita els estudis de metabolòmica in situ dirigits i/o no dirigits per a diversos camp com la investigació clínica, medioambiental, forense i farmacèutica.La caracterización in situ de la composición molecular de los tejidos biológicos es indispensable en la investigación clínica, farmacéutica y forense. Las técnicas de imagen molecular, como la espectrometría de masas de imagen y las imágenes por espectroscopia Raman, emplean materiales nanoestructurados para abordar desafíos como la baja sensibilidad, la especificidad y la resolución lateral. El objetivo de esta tesis es diseñar, fabricar, evaluar y aplicar un sustrato nanoestructurado basado en oro y silicio (que denominamos “AuBSi”) compatible con aplicaciones de espectrometría de masas de imágenes por desorción / ionización por láser asistidas por superficie (SALDI-MS) y espectroscopía Raman intensificada por superficie (SERS). Los resultados demuestran que el sustrato AuBSi es reproducible, fácil de usar, rentable y altamente confiable. Garantiza una fácil preparación de la muestra y es totalmente compatible con ambas modalidades de imagen, lo que permite un enfoque verdaderamente multimodal. Mostramos que existe una unificación entre los formatos de datos SALDI y SERS, que permite la integración completa del flujo de trabajo de procesamiento de imágenes y el coregistro de imágenes.Se han probado las capacidades de obtención de imágenes del sustrato AuBSi en varias soluciones de estándares, secciones histológicas de tejido animal (hígado, riñón y cerebro de ratón) y huellas dactilares. El análisis multimodal de huellas dactilares destacó las excelentes capacidades del sustrato para acoplar imágenes SALDI y SERS, al tiempo que se consiguen paliar las limitaciones de cada técnica. Así, el sustrato AuBSi desarrollado en esta tesis facilita los estudios de metabolómica in situ dirigidos y / o no dirigidos para diversos campos como la investigación clínica, medioambiental, forense y farmacéutica.
Characterising in situ the molecular composition of biological tissues is an indispensable tool in clinical, pharmaceutical and forensic research. Imaging modalities such as mass spectrometry imaging and Raman spectroscopy imaging employ nanostructured materials for addressing challenges such as low sensitivity, specificity and lateral resolution. The aim of this thesis is to design, fabricate, evaluate and apply a gold- and silicon-based nanostructured substrate (named AuBSi) compatible with surface-assisted laser desorption/ionization (SALDI) and surface-enhanced Raman spectroscopy (SERS) imaging applications. Results demonstrate that the AuBSi substrate is reproducible, user-friendly, cost effective and highly reliable. It ensures easy sample preparation and is fully compatible with both imaging modalities, enabling a genuine multimodal approach. We show that there is a unification between SALDI and SERS data formats that allows the full integration of the image processing workflow and the straightforward coregistration of images. We tested the imaging capabilities of the AuBSi on several standard solutions, animal tissue sections (mouse liver, kidney and brain) and fingerprints. The multimodal analysis of fingerprints highlighted the excellent capabilities of the substrate to couple SALDI and SERS imaging, while dealing with the challenges of each technique. Thus, the AuBSi substrate developed in this thesis facilitates targeted and/or untargeted in situ metabolomics studies for various fields such as clinical, environmental, forensics, and pharmaceutical research.
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Azziz, Aicha. "Étude structurale des brins d'ADN et de leurs interactions par diffusion Raman exaltée de surface". Electronic Thesis or Diss., Le Mans, 2024. https://cyberdoc-int.univ-lemans.fr/Theses/2024/2024LEMA1024.pdf.
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Le développement de méthodes rapides et sensibles de détection et d’étude de l’ADN suscite un intérêt croissant notamment dans le domaine biomédical pour le diagnostic moléculaire.Dans ce cadre, la technique de diffusion Raman exaltée de surface (SERS) s’est révélée être un outil idéal pour l'étude de la structure des brins d'ADN et des interactions moléculaires entre deux brins d'ADN.Dans un premier temps, nous avons évalué les capacités de détection de plusieurs substrats SERS commerciaux en utilisant une solution diluée de 4-MBA. Cette étude nous a permis de déterminer quel substrat présentait les meilleures performances SERS et lequel pouvait être exploité pour l'étude des brins d'ADN. Des nanoparticules colloïdales ont également été utilisées pour travailler en milieu liquide.Les signatures spectrales de plusieurs séquences d'ADN ont été étudiées avec des séquences monobases ou polybases. Nous avons pu obtenir des spectres de référence pour chaque base et montrer une dépendance du signal en fonction de la séquence.La caractérisation spectrale des brins d'ADN avant et après hybridation avec un brin complémentaire nous a permis de suivre les changements structuraux des brins d'ADN induits par l'hybridation. Nous avons pu mettre en évidence des modifications de l’orientation ou la diminution de la flexibilité des brins lors de l’hybridation en absence et en présence des mésappariements. Grace à l’utilisation d’outils d’analyses comme l'analyse par composante principale, il a été possible d’analyser et interpréter les données et de proposer des modèles d'interaction moléculaireThe development of rapid and sensitive methods for DNA detection and analysis is gaining increasing interest, particularly in the biomedical field for molecular diagnostics.In this context, surface-enhanced Raman scattering (SERS) has proven to be an ideal tool for studying the structure of DNA strands and the molecular interactions between two DNA strands.Initially, we assessed the detection capabilities of several commercial SERS substrates using a diluted 4-MBA solution. This study allowed us to determine which substrate exhibited the best SERS performance and could be exploited for the study of DNA strands. Colloidal nanoparticles were also employed for experiments in liquid media.The spectral signatures of several DNA sequences were studied using monobase or polybase sequences. We were able to obtain reference spectra for each base and demonstrate a signal dependency based on the sequence.Spectral characterization of DNA strands before and after hybridization with a complementary strand allowed us to track structural changes in the DNA strands induced by hybridization. We were able to highlight modifications in orientation or reduced flexibility of the strands during hybridization, both in the presence and absence of mismatches. Through the use of analytical tools such as principal component analysis, it was possible to analyze and interpret the data, leading to proposed models of molecular interaction
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Rahmani, Meryem. "Analyses Raman multispectrales exaltées pour la détection de molécules sous forme de trace". Electronic Thesis or Diss., Le Mans, 2024. http://www.theses.fr/2024LEMA1004.
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Au cours des dernières décennies, l'utilisation des produits phytosanitaires communément appelés pesticides a augmenté. Ces substances sont devenues de plus en plus présentes dans notre environnement, s’'accumulant ainsi dans les sols, l'air et les eaux. Ces produits, même en très faible concentration, représentent un danger pour la santé humaine, végétale et animale. Pour toutes ces raisons il est important d'encadrer l'utilisation des produits phytosanitaires en interdisant l'utilisation de certaines de ces substances et en mettant en place des réglementations pour fixer les Limites Maximales de Résidus (LMR). Il est aussi nécessaire de développer de nouvelles méthodes de détection et d’identification de polluants à l'état de trace car les techniques conventionnelles nécessitent de gros équipements de laboratoire qui ne sont pas compatibles avec des analyses sur site.Dans le cadre de nos travaux, nous utilisons la Diffusion Raman Exaltée de Surface (DRES) pour détecter et identifier des molécules à l’'état de trace. Nous avons étudié et analysé les performances de trois substrats DRES commerciaux (Hamamatsu, SERSitive et Ocean Insight) pour la détection et l'identification d'une molécule modèle à des concentrations de l'ordre de 10-6 M et 10-8 M. Nous avons comparé les réponses Raman à partir des cartographies enregistrées sur leurs surfaces à deux longueurs d’onde incidentes. Nous avons également développé et optimisé des supports métalliques nanorugueux capables de détecter et identifier des molécules avec une limite de détection à 10-9 M. Nous présenterons le protocole expérimental utilisé pour fabriquer ces substrats nanorugueux en or. Ensuite, nous avons étudié les propriétés topographiques des surfaces pour mieux comprendre les propriétés d'exaltation des substrats. Ces derniers sont analysés par microscopie électronique à balayage et par microscopie à force atomique (AFM). Les réponses optiques des supports nanorugueux sont étudiées en champ proche par photoémission d’électrons (PEEM) et en champ lointain par spectrométrie Raman une fois ces supports mis en contact avec des solutions contenant des molécules à très faibles concentrations. Nous avons comparé la réponse spectrale, les distributions d'intensité, et la stabilité sous faisceau laser, des substrats nanorugueux en or et le substrat le plus efficace parmi les trois substrats DRES commerciaux en analysant les spectres Raman à une concentration de 10-8 M.La stabilité de la réponse Raman des substrats DRES commerciaux et du substrat nanorugueux optimisé a été étudiée dans le temps, pendant une durée de plusieurs mois. Avec le temps, l'efficacité des substrats diminue et il n'est alors plus possible de détecter la présence des molécules. Nous avons développé une méthode qui permet d'améliorer les performances Raman de ces substrats vieillis. Les performances de ces substrats améliorés ont été étudiées en analysant les distributions d'intensité Raman à partir d'imagerie contenant plusieurs centaines de spectres. Nous avons utilisé les substrats nanorugueux en or pour détecter les molécules présentes dans un mélange binaire de molécules modèles à une concentration de 10-8 M. Nous avons analysé les cartographies Raman en utilisant des outils chimiométriques, à savoir l’'Analyses en Composantes Principales (ACP), et la Multivariate Curve Resolution (MCR)In recent decades, the use of phytosanitary products commonly called pesticides has increased. These substances have become increasingly present in our environment, accumulating in soil, air and water. Even at very low concentration these products represent a danger to human, plant and animal health. For all these reasons it is important to regulate the use of phytosanitary products by prohibiting the use of certain of these substances and by strengthening regulations to set Maximum Residue Limits (MRLs) as low as possible. It is also necessary to develop new methods for detecting and identifying trace pollutants because conventional techniques require large laboratory capabilities which are not compatible with on-site analyses.In my PhD. work, we have used Surface Enhanced Raman Scattering (SERS) to detect and identify trace molecules. We studied and analyzed the performance of three commercial DRES substrates (Hamamatsu, SERSitive and Ocean Insight) for the detection and identification of a model molecule at concentrations of the order of 10-6 M and 10-8 M. We compared the Raman responses from the Raman maps recorded on their surfaces at two incident wavelengths. We have also developed and optimized efficient nanorough metallic substrates to detect and identify molecules with a detection limit of 10-9 M. We will present the experimental protocol used to fabricate our nanorough gold substrates. The topographical properties of the surfaces were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM) to better understand the reason of SERS properties of the substrates. The optical responses of our nanorough substrates were studied in the near field by electron photoemission (PEEM) and in the far field by Raman spectrometry after putting them in contact with solutions containing molecules at very low concentrations. We compared the spectral response, intensity distributions, and stability under laser beam, of gold nanorough substrates and the most efficient substrate among the three commercial DRES substrates by analyzing the Raman spectra at a concentration of 10-8 M.The stability of the Raman response of the commercial SERS substrates and our optimized nanorough substrates was studied over time, for a period of several months. The effectiveness of the substrates decreases over time and it is no longer possible to detect the presence of the molecules after several months. In my PhD work we have tested a method that makes it possible to improve the Raman performance of these aged substrates. The performance of these improved substrates was studied by analyzing Raman intensity distributions from imaging containing several hundred spectra. Finally, we used the gold nanorough substrates to detect molecules present in a binary mixture of model molecules at a concentration of 10-8 M. We analyzed the Raman maps using chemometric tools, namely Component Analysis. Principal (ACP), and Multivariate Curve Resolution (MCR)
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Michel, Beat A. "Phénomène, sens et substrat : pour une métaphysique phénoménologique". Thesis, Paris 10, 2020. http://www.theses.fr/2020PA100056.
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Quel est le substrat de la conscience, ou encore « qu’est-ce qui fait la conscience » ? Poser cette question revient à ne pas se satisfaire d'une réponse, qui peut paraître aller de soi, affirmant que ce substrat est le cerveau. En fait, situer le substrat de la conscience dans le corps objectif, comme partie du monde – que ce soit dans le contexte de la phénoménologie, de la philosophie de l’esprit ou du naturalisme – mène à une ontologie circulaire : la conscience dans le corps, le corps dans le monde, le monde pensé, perçu, conçu, constitué par la conscience. Or, même si toute circularité n’est pas nécessairement problématique, nous cherchons à montrer que cette circularité d’une ontologie générale est bien rédhibitoire. Aussi, nous empruntons une autre voie, partant du corps subjectif vers un substrat qui n’est pas situé dans le monde. Le concept de substrat transcendantal est construit en opérant deux fusions consécutives de concepts existants. Il s’agit d’abord de réunir en un seul concept, celui de substrat abstrait, le hylémorphisme aristotélicien, d’une part, et l’idée de survenance issue de la philosophie de l’esprit, d’autre part, en établissant que les deux sont, d’une certaine manière, coextensifs. Nous faisons ensuite appel à la notion de Vie absolue, introduite par Michel Henry dans la dernière période de son œuvre, en l’interprétant comme un cas particulier de la notion de substrat abstrait. Le résultat de cette deuxième unification conceptuelle, nous l’appelons substrat transcendantal – transcendantal au sens kantien. Enfin nous utilisons le terme d’adhérence pour désigner l’expérience vécue que fait le sujet transcendantal du substrat transcendantalWhat is the substrate of consciousness, or what is it that “makes consciousness”? Asking this question amounts to not being satisfied with an answer that may seem self-evident: this substrate is the brain. In fact, situating the substrate of consciousness in the objective body, as part of the world - whether in the context of phenomenology, philosophy of mind or naturalism - leads to a circular ontology: consciousness in the body, the body in the world, the world thought, perceived, conceived, constituted by consciousness. However, even if all circularity is not necessarily problematic, we seek to show that this circularity of a general ontology is indeed fatal. So we take another path, from the subjective body to a substrate that is not located in the world. This substrate is constructed as an abstract notion, by operating two consecutive merges of existing concepts. First we bring together in a single concept, that of abstract substrate, the Aristotelian hylemorphism, on the one hand, and the idea of supervenience, from the philosophy of the mind, on the other hand, by establishing that the two are, in a way, coextensive. We then appeal to the notion of absolute Life, introduced by Michel Henry in the last period of his work, interpreting it as a particular case of the notion of abstract substrate. The result of this second conceptual unification, is what we call transcendental substrate - transcendental in the Kantian sense. Finally we use the term adherence to designate the lived experience that the transcendental subject makes of the transcendental substrate
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Speed, Jonathon. "Tailoring plasmonic substrates for SERS". Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/191315/.
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SERS is a useful spectroscopic technique that was discovered 30 years ago, and has recently seen a renaissance in research. Sphere segment void (SSV) substrates have been developed as reproducible, stable SERS substrates by electrodeposition of a metal through a colloidal template. The effect of adsorbing an organic monolayer on the surface of an SSV substrate was studied, which results in a slight shift in the plasmonic absorption. This was compared with the reduction of a diazonium salt on the surface, which results in a significant increase in plasmonic absorption, attributed to a physical sharpening of the metal structure, and in turn better defined plasmon modes. The Au surface was also modified with an ultra thin layer of Pt, and a comparison was made between oxidation-reduction cycled roughened (ORC) and SSV substrates with and without Pt. The SSV substrates were found to be more reproducible, and (after modification with a thin-layer of Pt), gave spectra more representative of bulk Pt substrates than ORC. Lastly the surface was functionalised with metallic nanoparticles (NPs), and a large increase in spectral intensity was observed. This was attributed to a strongly localised electric field between the NP and the substrate, which resulted in an additional enhancement of between 102-103 depending on the method of assembly used. Functionalisation of the NPs introduced the possibility of drug detection or studies in drug delivery using such a system.
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Eliasson, Kasper. "Quantification using SERS on a colloidal substrate". Thesis, Uppsala universitet, Fasta tillståndets fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-443582.
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This thesis explores the practical usefulness of surface enhanced Raman spectroscopy on a colloidal substrate for quantification of organic analytes in a water matrix. The method evaluated is very simple and accessible as it utilizes a commercially available hand held Raman spectrometer and citrate reduced silver colloid substrate. Spectra of 4-mercaptopyridine (Mpy) and riboflavin (Rf) samples in distilled water were recorded. A Raman enhancement factor on the order of 108 was achieved for Mpy and its limit of detection was 0.1 nM. The standard deviation of Mpy intensity was <10% for 25 nM samples recorded at the same point in time, but significantly higher for samples recorded at different times. Mpy and Rf could be detected in parallel and both analytes had a close to linear Raman intensity to concentration relationship over a 100 times relative concentration change. We conclude that with improved substrate stability, a similar method should be practically applicable for quantification of suitable analytes down to the nM-range in samples of well defined composition. Considering the method's simplicity and the limited optimization efforts it has a large room for improvement.
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Yan, Bo. "Rationally designed substrates for SERS biosensing". Thesis, Boston University, 2013. https://hdl.handle.net/2144/12894.
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Thesis (Ph.D.)--Boston UniversityThe large electromagnetic field enhancement provided by nanostructured noble metal surfaces forms the foundation for a series of enabling optical analytical techniques, such as surface enhanced Raman spectroscopy (SERS), surface enhanced IR absorption spectroscopy (SEIRA), surface enhanced fluorescent microscopy (SEF), to name only a few. Critical sensing applications have, however, other substrate requirements than mere peak signal enhancement. The substrate needs to be reliable, provide reproducible signal enhancements, and be amenable to a combination with microfluidic chips or other integrated sensor platforms. These needs motivate the development of engineerable SERS substrate "chips" with defined near- and far-field responses. In this dissertation, two types of rationally designed SERS substrates - nanoparticle cluster arrays (NCAs) and SERS stamp - will be introduced and characterized. NCAs were fabricated through a newly developed template guided self-assembly fabrication approach, in which chemically synthesized nanoparticles are integrated into predefined patterns using a hybrid top-down/bottom-up approach. Since this method relies on chemically defined building blocks, it can overcome the resolution limit of conventional lithographical methods and facilitates higher structural complexity. NCAs sustain near-field interactions within individual clusters as well as between entire neighboring clusters and create a multi-scale cascaded E-field enhancement throughout the entire array. SERS stamps were generated using an oblique angle metal deposition on a lithographically defined piston. When mounted on a nanopositioning stage, the SERS stamps were enabled to contact biological surfaces with pristine nanostructured metal surfaces for a label-free spectroscopic characterization. The developed engineered substrates were applied and tested in critical sensing applications, including the ultratrace detection of explosive vapors, the rapid discrimination of bacterial pathogens, and the label-free monitoring of the enzymatic degradation of pericellular matrices of cancer cells.
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Sharma, Narayan. "Solution Processable Surface Enhanced Raman Spectroscopy (SERS) Substrate". Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1434375587.
Texto completo da fonteLivros sobre o assunto "SERS SUBSTRAT"
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Hortin, N. J. The development of new sers substrates for remote optical sensing. Manchester: UMIST, 1997.
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Carneiro, Maria Luiza Tucci. Dez Mitos sobre os Judeus. Imprensa da Universidade de Coimbra, 2021. http://dx.doi.org/10.14195/978-989-26-2167-8.
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Dez Mitos sobre os Judeus convida os leitores a uma viagem de exploração ao imaginário coletivo e à reflexão sobre a persistência de um pensamento antissemita desde a antiguidade até os dias atuais. Este livro – que guarda alguns dos principais mitos sobre os judeus – foi organizado no formato de um breviário, ou seja, uma composição de textos breves que podem ser lidos em doses homeopáticas. Não têm uma ordem obrigatória, apesar de numerados, pois assim são os mitos: cada qual tem vida própria, formando um imbricamento, como se estivessem sobrepostos em partes, como escamas ou telhas, unidos num enraizamento profundo advindo do substrato construído de geração em geração.
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Bucher, Taina. Conclusion. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190493028.003.0007.
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When conceptualizing the power and politics of algorithms it is important to blend an understanding of their material substrates with an understanding of the multiple ways of perceiving, feeling, acting, and knowing which congeal around algorithms as an object of social concern. The concluding chapter revisits some of the key questions of the book and looks at how algorithmic power and politics can be understood if power and politics are not necessarily about imposing force from above. The chapter serves to summarize the key contributions of the book in terms of: (1) providing an understanding of algorithms that is not committed to one ontological position, but instead sees algorithms in terms of a multiple and variable ontology, (2) helping to identify forms of algorithmic power and politics and (3) offering a theoretical framework for the kinds of work that algorithms do and the landscapes they help to generate.
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Leite, Maria José de Holanda. Co-produtos da extração de vermiculita na produção de mudas de espécies arbóreas da Caatinga. Editora Amplla, 2021. http://dx.doi.org/10.51859/amplla.cpe535.1121-0.
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A degradação ambiental ocorre principalmente nas regiões áridas, semiáridas e subúmidas secas do planeta, e resulta de fatores climáticos e antrópicos tais como as atividades pecuárias, de agricultura e de mineração (LIMA, 2004). Especificamente na região semiárida do nordeste do Brasil, que se estende por mais de 980 km2 distribuídos em todos os Estados nordestinos (exceto o Maranhão) e no norte de Minas Gerais, o desequilíbrio ambiental atinge mais de 20 milhões de hectares, o que equivale a mais de 12% da região Nordeste e quase 22% da região semiárida nordestina (MEDEIROS et al., 2012; SILVA et al., 2004). Estes autores informam que este quadro é mais crítico no Ceará e na Paraíba, onde a degradação ambiental é observada em mais da metade dos seus territórios. Esta degradação tem um forte componente humano, pois 21,3 milhões de habitantes habitam essa região, além dos rebanhos constituídos de 23,9 milhões de bovinos, 8,8 milhões de caprinos e 8,0 milhões de ovinos que se alimentam da vegetação nativa (IBGE, 2007; MEDEIROS et al., 2012), sendo por isso considerada a região semiárida mais populosa e com maior grau de antropismo do planeta (DRUMOND et al., 2000). As atividades humanas, tais como a pecuária e a mineração praticadas de maneira inadequada, podem desencadear processos de degradação ambiental, caracterizada pelo empobrecimento da flora e da fauna, erosão do solo e deterioração da qualidade da água dos rios e dos reservatórios (AZEVÊDO, 2011). Especificamente no solo, a densidade e a porosidade da camada superficial são os atributos mais prejudicados e precisam ser melhorados para favorecer a regeneração da vegetação, pois desequilíbrios nesses atributos prejudicam o desenvolvimento do sistema radicular e no estabelecimento e crescimento das plantas (NUNES, 2012). A mineração é uma atividade de forte impacto ambiental, pois implica geralmente na remoção da camada superficial do solo na área da jazida e na deposição superficial de rejeitos (BARRETO, 2001). A exploração da vermiculita, um produto utilizado na construção civil, melhoria das propriedades físicas de solos agrícolas, produção de cerâmica e remediação de solos contaminados por petróleo (NASCIMENTO, 2008). Há várias jazidas em exploração na região Nordeste do Brasil, uma delas no município de Santa Luzia-PB. Em visita à Mineradora Pedra Lavrada, que extrai a vermiculita no município de Santa Luzia, constatou-se a presença de crateras resultantes da extração do minério e a deposição de rejeitos no entorno da unidade de beneficiamento. Estes rejeitos não têm valor comercial que justifique o seu processamento. Este material de menor valor, doravante denominado de coproduto, afeta diretamente o ambiente pela ocupação de áreas de Caatinga, causando poluição visual e soterrando a vegetação nativa. Além disto, provoca efeitos indiretos no ambiente quando é carreado pelo vento e pelas águas pluviais, poluindo a água e assoreando rios e reservatórios. Este material de menor valor comercial é gerado quando a rocha é moída, e a vermiculita é separada de acordo com a sua granulometria. Dos cinco co-produtos gerados, apenas os de menor granulometria (poeira fina e ultrafina) são compatíveis para a produção de mudas, pois as pedras e pedaços menos friáveis do minério não apresentam, por motivos óbvios, potencial para a nutrição de plantas. Estes dois co-produtos provêm de um material friável do grupo das micas que formam silicato hidratado de magnésio, ferro e alumínio e constitui uma fonte de Ca, K e Mg para as plantas (NASCIMENTO, 2008). A utilização destes co-produtos se mostrou adequada para compor até 50% do substrato de produção de mudas de maracujá Passiflora edulis Sims. f. flavicarpa Deg.) (LEITE, 2012) e pinhão manso (Jatropha curcas L.) (TRAJANO, 2010), propiciando ao substrato boas características de porosidade e capacidade de retenção de umidade, o que sugere a possibilidade de seu uso na produção de mudas de outras espécies. As mudas produzidas com estes co-produtos poderiam ser direcionadas para plantios em geral ou para a revegetação de áreas degradadas pela mineração, num círculo virtuoso em que a degradação ambiental provocada pela mineração em si e pela deposição dos co-produtos no ambiente seria parcialmente revertida pela utilização dos co-produtos gerados.
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Domhoff, G. William. The Emergence of Dreaming. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190673420.001.0001.
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This book presents a new neurocognitive theory of dreams that documents the similarities of dreaming to waking thought, demonstrates that personal psychological meaning can be found in a majority of dream reports, has a strong developmental dimension based on excellent longitudinal and cross-sectional studies carried out in sleep labs with children ages 3–15, locates the neural substrate for dreaming in the same brain network active during mind-wandering and daydreaming, and marshals the evidence that shows it is very unlikely that dreaming has any adaptive function. These claims are based on five different sets of descriptive empirical findings that were developed between the late 1950s and the first sixteen years of the twenty-first century. All of these findings were unanticipated by scientific dream researchers and then resisted to varying degrees by dream theorists for a variety of reasons. The first five chapters spell out the theory and the evidence for it without any discussion or criticism of past theories. The next two chapters present detailed criticisms of two major alternative theories. The penultimate chapter presents evidence that it is very unlikely that dreaming has any adaptive function in the evolutionary sense of the term, although humans have invented uses for dreams in religious and healing rituals. In that regard, dreaming has an emergent function in culture that was invented in the course of history due to human cognitive capacities. The final chapter presents a general agenda for future research using new methodologies to test all of the neurocognitive hypotheses.
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Leite, Maria José de Holanda. Gesso e rejeitos de mineração na correção de um solo salino-sódico e no crescimento inicial do maracujazeiro amarelo. Amplla Editora, 2022. http://dx.doi.org/10.51859/amplla.grm747.1122-0.
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O maracujazeiro-amarelo é considerado uma espécie sensível aos sais (Ayers & Westcot, 1999). Assim o declínio produtivo da cultura deve ocorrer quando a condutividade elétrica do ambiente radicular das plantas atingisse valores superiores a 1,3 dS m-1. Entretanto, algumas pesquisas têm demonstrado que, apesar da salinidade provocar reflexos negativos no crescimento, na capacidade produtiva da cultura e na qualidade dos frutos (Soares et al., 2008; Cavalcante et al., 2009), a utilização de corretivos pode amenizar os efeitos da salinidade, resultando em maior desenvolvimento das mudas e produção de frutos pelas plantas (Souza et al., 2008). Alguns trabalhos mostraram que a utilização de rejeitos de mineração como constituinte de substratos para emergência e produção de mudas de várias espécies vegetais, como Carica papaya L. (Alencar, 2004); Moringa oleifera Lam. (Alves, 2005); Jatropha curcas L. (Trajano et al., 2010); Cnidoscolus quercifolius Pohl. (Farias Júnior, 2011) e Mimosa caesalpiniifolia Benth. (Rodrigues, 2011), pode ser uma alternativa promissora para diminuição dos impactos ambientais destes rejeitos. Contudo, estudos avaliando o efeito destes rejeitos em solos salinizados são quase inexistentes. O presente trabalho teve o objetivo de avaliar o efeito do gesso agrícola e doses de rejeitos de vermiculita e de caulim, sobre os atributos químicos de um solo salino-sódico e o crescimento do maracujazeiro amarelo.
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Balsiger, Jörg, e Stacy D. VanDeveer. Regional Governance and Environmental Problems. Oxford University Press, 2018. http://dx.doi.org/10.1093/acrefore/9780190846626.013.416.
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Only recently has international environmental politics scholarship focused more explicitly on “regionalism” as a distinct phenomenon, one which has received much more sustained attention among specialists in international security and international political economy. By the early twenty-first century, regional environmental governance had become commonplace. Since the term “region” has had different connotations in different disciplines, the analytic and empirical scope of studies of regional environmental governance has varied considerably. As such, analyses of regional environmental cooperation have incorporated both constructivist views of regions that transcend the nation-state grid, and rescaling arguments placing greater emphasis on subnational governments, transboundary mobilization, and the importance of ecoregional initiatives. Regional agreements increasingly point to some sort of ecoterritoriality, state actors are increasingly complemented by nonstate or substate actors, and the thematic scope increasingly expands beyond purely environmental issues to encompass broader notions of sustainable development. There are three typical types of regional agreements: interstate regional environmental governance, ecoregional environmental governance, and ecoregional sustainable development governance. Interstate regional environmental governance is most typical of regional economic organizations with an environmental mandate that covers single or multiple environmental issues. Meanwhile, ecoregional environmental governance is widely seen in agreements for mountain ranges, regional seas, or river basins. Case studies on marine and mountain regional environmental governance illustrate that various regional arrangement remain in quite different states of institutionalization. Yet they also illustrate the growth of ecoregionalism in transnational environmental governance.
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Daguerre, Blandine. Passage et écriture de l’entre-deux dans El Pasajero de Cristóbal Suárez de Figueroa. Presses Universitaires de Pau et des Pays de l'Adour, 2020. http://dx.doi.org/10.46608/primaluna3.9782353111220.
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Espagne, premier quart du XVIIe siècle : quatre hommes se rencontrent au cours d’un voyage entre Madrid et Barcelone où ils doivent partir pour l’Italie pour y tenter leur chance. Pour lutter contre la pénibilité de leur périple et éviter l’ennui, ils décident de converser. S’ensuit un échange de plus de 200 pages autour de leur destination, de leur parcours personnel respectif, de la société de l’époque au sein duquel viennent s’intercaler des récits à vocation plus ludique. Telle est l’intrigue de El Pasajero, advertencias utilísimas a la vida humana, œuvre citée par bon nombre de spécialistes du Siècle d’Or qui s’attachent tous à saluer ses qualités littéraires et à laquelle aucune étude littéraire de fond n’a été consacrée. Comment expliquer un tel paradoxe? El Pasajero propose un caléidoscope de la société de l’époque, d’où l’orientation sociologique de la plupart des études réalisées sur ce texte. La mauvaise presse de son auteur connu pour son tempérament peu amène et pour son opposition à Cervantès, a pu y contribuer également de manière plus tangentielle. Enfin et surtout, la richesse textuelle, littéraire et idéologique de El Pasajero peut avoir freiné certaines ambitions analytiques. Le texte de Figueroa est d’une nature profondément hybride, il se caractérise par un oscillement perpétuel entre inspiration italienne, accents décaméroniens, emprunts transtextuels et substrat folklorique hispanique. Il joue sur la porosité des frontières entre réalité et fiction pour élaborer un texte dont tous les éléments semblent dialoguer et entre lesquels le lecteur passe comme sur les pierres d’un gué. En fin de compte, El Pasajero est un véritable laboratoire d’expérimentation littéraire où affleurent traditions littéraires ancrées et propositions d’écriture plus innovantes. Ce dialogue perpétuel est décisif dans l’œuvre : au-delà d’un premier dialogue évident entre les personnages, le texte en propose d’autres en filigrane, entre les formes et les genres littéraires. Ils fonctionnent comme autant d’éléments structurants au sein de cette œuvre pensée comme un lieu de passage où se mêlent expérimentations littéraires et réflexions sociétales. El Pasajero peut parfois laisser le lecteur perplexe, c’est un fait. Il fait, néanmoins, partie de ces textes qui fascinent et qui n’ont pas encore révélé tous leurs secrets. Une chose est certaine : El Pasajero ne laisse pas indifférent et mérite qu’on lui consacre une étude de fond. C’est ce que se propose de faire cet ouvrage…
Capítulos de livros sobre o assunto "SERS SUBSTRAT"
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Wang, Yuling, e Erkang Wang. "Nanoparticle SERS Substrates". In Surface Enhanced Raman Spectroscopy, 39–69. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527632756.ch2.
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Garrett, N. L. "Naturally Inspired SERS Substrates". In Raman Spectroscopy for Nanomaterials Characterization, 75–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-20620-7_4.
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Hasna, Kudilatt, e M. K. Jayaraj. "Metal Oxides-Based SERS Substrates". In Materials Horizons: From Nature to Nanomaterials, 155–75. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3314-3_5.
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Baia, Monica, Simion Astilean e Traian Iliescu. "New Developments in SERS-Active Substrates". In Raman and SERS Investigations of Pharmaceuticals, 187–205. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78283-4_8.
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de la Chapelle, Marc Lamy. "Optimisation of Plasmonic Substrates for SERS Application". In Encyclopedia of Nanotechnology, 1–7. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6178-0_101018-1.
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de la Chapelle, Marc Lamy. "Optimization of Plasmonic Substrates for SERS Application". In Encyclopedia of Nanotechnology, 3074–80. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-9780-1_101018.
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Fasolato, Claudia. "Nanoparticle-Based SERS Substrates for Molecular Sensing Applications". In Surface Enhanced Raman Spectroscopy for Biophysical Applications, 85–112. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03556-3_4.
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Rigó, I., M. Veres, L. Himics, T. Váczi e P. Fürjes. "Preparation and Characterization of SERS Substrates of Different Morphology". In NATO Science for Peace and Security Series B: Physics and Biophysics, 63–68. Dordrecht: Springer Netherlands, 2018. http://dx.doi.org/10.1007/978-94-024-1298-7_8.
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Habermehl, Anne, Xin Liu, Carsten Eschenbaum e Uli Lemmer. "Fabrication of SERS Substrates by Roll-to-Roll Hot Embossing". In NATO Science for Peace and Security Series B: Physics and Biophysics, 513–15. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-0850-8_55.
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Liu, Mei, Yan Peng e Zhizheng Wu. "Simulation and Optimization of Nanoparticle Patterned Substrates for SERS Effect". In Progress in Optomechatronic Technologies, 133–39. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05711-8_14.
Texto completo da fonteTrabalhos de conferências sobre o assunto "SERS SUBSTRAT"
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Portes, Ary V. R., Felipe M. F. Teixeira, Talles E. M. Marques e Jhonattan C. Ramirez. "Electrically Tunable SERS Substrate Using Gold Nanopyramids on Graphene". In Frontiers in Optics, JW4A.45. Washington, D.C.: Optica Publishing Group, 2024. https://doi.org/10.1364/fio.2024.jw4a.45.
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This work presents electrically tunable SERS devices, consisting of gold nanopyramids on a graphene-coated dielectric substrate. Simulations reveal significant improvements in absorbance and precise modulation of field enhancement, offering promising avenues for biosensing applications.
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Choudhary, Riya, Kaushal Vairagi, Samir K. Mondal e Sachin K. Srivastava. "Bessel Beam-Instigated Two-Fold SERS Enhancement in AuNP Structures Compare to Drop Casting". In JSAP-Optica Joint Symposia, 17a_A34_6. Washington, D.C.: Optica Publishing Group, 2024. https://doi.org/10.1364/jsapo.2024.17a_a34_6.
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Since the discovery of SERS, due to its high sensitivity, it has been widely used in various fields such as biosensing, chemical sensing, and food safety etc., [1]. In SERS, when a probe molecule is placed near a metallic nanostructure it feels a localized field generated due to localized surface plasmons (LSPs) which effectively amplifies its Raman signal. The LSPs are the collective oscillation of free electrons in metallic nanostructures [2]. For the fabrication of the SERS active substrates various methods have been introduced to arrange the metallic nanoparticles (NPs) in specific morphologies and arrangements [3]. Optical forces of a laser beam can be employed to arrange metallic NPs efficiently on a substrate [4].
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Chopra, Aditi, Sudipta Sarkar Pal e Girish C. Mohanta. "Evaluation of silica TLC plates as Low-cost substrates for surface-enhanced Raman spectroscopy (SERS)". In Optical Sensors. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/sensors.2023.stu5d.4.
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Herein, we report a simple, low-cost substrate for surface-enhanced Raman spectroscopy (SERS). We utilized TLC plates as SERS substrates that has an edge over other paper-based substrates. Rhodamine 6G is used as Raman probe molecule to evaluate the performance of substrate.
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Zou, Wenlong, Zhijian Cai e Jianhong Wu. "Periodic nanostructures for SERS-active substrate". In International Conference on Optical Instruments and Technology 2015, editado por Jigui Zhu, Hwa-Yaw Tam, Kexin Xu, Hai Xiao e Sen Han. SPIE, 2015. http://dx.doi.org/10.1117/12.2192207.
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Hsu, C. H., L. T. Chiu, C. H. Chen e C. S. Lai. "Effective Membrane-based SERS Substrate Fabrication". In 2016 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2016. http://dx.doi.org/10.7567/ssdm.2016.h-1-05.
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Motla, Akanksha, Sumaya Nisar, Vikas Baranwal, Kavita Sharma, B. Sundarawel, Nita Dilawar Shrama, S. A. Khan e D. K. Avasthi. "Ion Beam Synthesis of SERS Substrate". In 2021 International Conference on Electrical Engineering and Photonics (EExPolytech). IEEE, 2021. http://dx.doi.org/10.1109/eexpolytech53083.2021.9614915.
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Pérez-Mayen, Leonardo, Jorge Oliva e Elder De la Rosa Cruz. "Selection criteria for SERS substrates". In Latin America Optics and Photonics Conference. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/laop.2014.lm4a.40.
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Ignat, Teodora, Irina Kleps, Mihaela Miu, Florin Craciunoiu, Adina Bragaru e Monica Simion. "Preparation of SERS-active porous gold substrate". In 2008 International Semiconductor Conference. IEEE, 2008. http://dx.doi.org/10.1109/smicnd.2008.4703367.
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Kitahama, Yasutaka, Huanhuan Zhang, Jun-Yu Dong, Xuke Tang, Naoki Kishimoto, Yunjie Deng, Yuji Kagotani, Motoyasu Adachi, Ting-Hui Xiao e Keisuke Goda. "Cost-effective flexible substrate for ultrabroadband SERS". In Plasmonics in Biology and Medicine XXI, editado por Tuan Vo-Dinh, Ho-Pui A. Ho e Krishanu Ray. SPIE, 2024. http://dx.doi.org/10.1117/12.3001988.
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Zhao, Yiping, Yongjun Liu, P. M. Champion e L. D. Ziegler. "The Silver Nanorod Array SERS Substrates". In XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482510.
Texto completo da fonteRelatórios de organizações sobre o assunto "SERS SUBSTRAT"
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Mu, Richard. Development of Focus-Free SERS Substrate Assembly. Fort Belvoir, VA: Defense Technical Information Center, janeiro de 2007. http://dx.doi.org/10.21236/ada524871.
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Sardana, Neha, Heena Sammi e Rajesh V. Nair. Reusable SERS substrate based on interconnected metal network structure. Peeref, junho de 2023. http://dx.doi.org/10.54985/peeref.2306p3513910.
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Halas, Naomi, e Joseph Jackson. Detection of Molecular and Biomolecular Species by Surface-Enhanced Raman Scattering: Nanoengineered Substrates for SERS Detection. Fort Belvoir, VA: Defense Technical Information Center, agosto de 2004. http://dx.doi.org/10.21236/ada426233.
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Tidd, Alexander N., Richard A. Ayers, Grant P. Course e Guy R. Pasco. Scottish Inshore Fisheries Integrated Data System (SIFIDS): work package 6 final report development of a pilot relational data resource for the collation and interpretation of inshore fisheries data. Editado por Mark James e Hannah Ladd-Jones. Marine Alliance for Science and Technology for Scotland (MASTS), 2019. http://dx.doi.org/10.15664/10023.23452.
Texto completo da fonteResumo:
[Extract from Executive Summary] The competition for space from competing sectors in the coastal waters of Scotland has never been greater and thus there is a growing a need for interactive seascape planning tools that encompass all marine activities. Similarly, the need to gather data to inform decision makers, especially in the fishing industry, has become essential to provide advice on the economic impact on fishing fleets both in terms of alternative conservation measures (e.g. effort limitations, temporal and spatial closures) as well as the overlap with other activities, thereby allowing stakeholders to derive a preferred option. The SIFIDS project was conceived to allow the different relevant data sources to be identified and to allow these data to be collated in one place, rather than as isolated data sets with multiple data owners. The online interactive tool developed as part of the project (Work Package 6) brought together relevant data sets and developed data storage facilities and a user interface to allow various types of user to view and interrogate the data. Some of these data sets were obtained as static layers which could sit as background data e.g. substrate type, UK fishing limits; whilst other data came directly from electronic monitoring systems developed as part of the SIFIDS project. The main non-static data source was Work Package 2, which was collecting data from a sample of volunteer inshore fishing vessels (<12m). This included data on location; time; vessel speed; count, time and position of deployment of strings of creels (or as fleets and pots as they are also known respectively); and a count of how many creels were hauled on these strings. The interactive online tool allowed all the above data to be collated in a specially designed database and displayed in near real time on the web-based application.
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Palhares Neto, Luiz, Leilane Gomes, José Marangon, Genilton Santos e Cecílio Caldeira Júnior. Protocolo de micropropagação de Cattleya milleri, espécie endêmica do quadrilátero ferrífero criticamente ameaçada de extinção. ITV, maio de 2022. http://dx.doi.org/10.29223/prod.tec.itv.ds.2022.12.palharesneto.
Texto completo da fonteResumo:
A espécie Cattleya milleri é uma orquídea endêmica dos Campos Rupestres Ferruginosos do Quadrilátero Ferrífero em Minas Gerais. Esta espécie é atualmente classificada como criticamente ameaçada de extinção sobretudo devido a restrição geográfica de sua ocorrência, degradação de seu habitat natural e reduzidas populações naturais. O estabelecimento de métodos de propagação e cultivo que possibilitem a rápida multiplicação desta espécie é etapa crucial para a conservação ex situ e também para o enriquecimento em áreas naturais e a manutenção da espécie em seu habitat. A micropropagação ou a propagação in vitro consiste na multiplicação em larga escala de plantas através do cultivo de células, tecidos, órgãos ou a planta inteira em meio nutritivo sob condições controladas de temperatura e luminosidade. As etapas da micropropagação são constantemente ajustadas de acordo com as necessidades das diferentes espécies. Diante disso, o objetivo do relatório foi descrever as etapas desenvolvidas para estabelecer o protocolo de micropropagação de C. milleri. O protocolo estabelecido foi dividido em quatro etapas: (1) coleta e assepsia do material vegetal, (2) estabelecimento e desenvolvimento in vitro, (3) aclimatização e rustificação e (4) reintrodução e monitoramento das mudas. Sementes de C. milleri foram retiradas de cápsulas maduras e transferidas para seringas. As seringas contendo as sementes foram preenchidas totalmente com a solução de hipoclorito de sódio (NaClO) a 0,3%. Após 12 minutos, em câmara de fluxo laminar, aproximadamente 1 mL da solução contendo as sementes foi adicionada em potes contendo 22 mL do meio de cultivo previamente esterilizado. O meio utilizado foi composto de sacarose (15g/L), fertilizante B&G® (3mL/L), carvão ativado (1,5g/L) e ágar nutriente (5g/L). A germinação foi observada em quase todas as sementes inoculadas, tendo início aos 25 dias. O processo de propagação in vitro de C. milleri teve duração de 18 meses, com dois episódios de repicagem durante esse período. As plantas responderam positivamente as condições in vitro, apresentando crescimento satisfatório da parte aérea e de raízes. Na etapa de aclimatização, as plantas enraizadas tiveram suas raízes lavadas e foram transplantadas para embalagens plásticas contendo musgo chileno e fragmentos de isopor. Após 450 dias de cultivo em estufa coberta com sombrite 80 (80% de interceptação) foi observada uma reduzida mortalidade de mudas. Posteriormente, plantas aclimatadas foram transplantadas para recipientes contendo substrato natural (contendo canga granular) e cultivadas em estufa com sombrite 80 e posteriormente em sombrite 50, onde permaneceram por 1.095 dias. Ao final da etapa de rustificação foram obtidas aproximadamente 3.000 mudas de C. milleri aptas para o plantio em ambiente natural. A reintrodução destas mudas ocorreu através do plantio das mudas na Serra da Calçada (MG). O monitoramento das plantas ocorre mensalmente com a quantificação das mudas sobreviventes. Após 2 anos de acompanhamento observou-se baixa taxa de mortalidade (-30%) e crescimento satisfatório das plantas. O processo de monitoramento continuará sendo realizado com o objetivo de avaliar os processos de floração e frutificação e recrutamento de novas plantas. Os resultados obtidos evidenciam que a técnica de propagação in vitro é uma alternativa viável para a produção em larga escala de mudas de qualidade da espécie C. milleri. Uma vez que esta é uma espécie criticamente ameaçada de extinção, a reintrodução de plantas em ambiente natural contribui para o enriquecimento das populações existentes e, consequentemente, a conservação da espécie em seu ambiente natural. Uma próxima etapa importante será avaliar a diversidade genética da espécie para determinação das matrizes prioritárias para propagação